fix: text black border plus animate line

src/components/Introduction.js

@@ -1,4 +1,4 @@
-import { useContext, useState, useEffect } from "react";
+import { useContext, useState, useEffect, useRef, useLayoutEffect } from "react";
 import { ThemeContext } from "../utils/themes/ThemeContext";
 import { Box, Typography } from "@mui/material";
 import styled from 'styled-components';
@@ -18,23 +18,36 @@ const sentences = [
     "?"
 ];
 
-const BlinkingTriangle = styled.div`
-  width: 0;
-  height: 0;
-  border-left: 15px solid transparent;
-  border-right: 15px solid transparent;
-  border-bottom: 25px solid ${props => props.color};
+const TriangleWrapper = styled.div`
   animation: blink 1s infinite;
+  transform: translateZ(0);
+
   @keyframes blink {
     0% { opacity: 1; }
     50% { opacity: 0; }
     100% { opacity: 1; }
   }
 `;
 
+const Triangle = styled.div`
+  width: 0;
+  height: 0;
+  border-left: 15px solid transparent;
+  border-right: 15px solid transparent;
+  border-bottom: 25px solid ${props => props.color};
+`;
+
 const Introduction = () => {
     const {theme} = useContext(ThemeContext);
     const [currentSentence, setCurrentSentence] = useState(0);
+    const textRef = useRef(null);
+    const [lineWidth, setLineWidth] = useState(0);
+
+    useLayoutEffect(() => {
+        if (textRef.current) {
+            setLineWidth(textRef.current.offsetWidth);
+        }
+    }, [currentSentence]);
 
     useEffect(() => {
         console.log("Length of sentences: ", sentences.length);
@@ -46,8 +59,33 @@ const Introduction = () => {
 
     return (
         <Box id="home" sx={{display: "flex", flexDirection: "column", justifyContent: "center", alignItems: "center", backgroundColor: theme.BackgroundColor, paddingTop: "120px", minHeight: "calc(100vh - 120px)"}}>
-            <Typography sx={{fontSize: 40, color: theme.BoldTextColor, textDecoration: 'underline', textUnderlineOffset: '10px', marginBottom: "10px", fontWeight: "bold", fontFamily: "'Magda Clean Mono', monospace"}}>{sentences[currentSentence]}</Typography>
-            <BlinkingTriangle color={theme.MainColor} />
+            <Box sx={{ display: "flex", flexDirection: "column", alignItems: "center" }}>
+                <Typography
+                    ref={textRef}
+                    sx={{
+                        fontSize: 40,
+                        color: theme.BoldTextColor,
+                        fontWeight: "bold",
+                        fontFamily: "'Magda Clean Mono', monospace",
+                        display: "inline-block"
+                    }}
+                >
+                    {sentences[currentSentence]}
+                </Typography>
+
+                <Box
+                    sx={{
+                        height: "2px",
+                        backgroundColor: theme.BoldTextColor,
+                        width: lineWidth,
+                        transition: "width 0.5s ease-in-out",
+                        marginBottom: "10px",
+                    }}
+                />
+            </Box>
+            <TriangleWrapper>
+                <Triangle color={theme.MainColor} />
+            </TriangleWrapper>
         </Box>
     );
 };